225631
Descrição
Quiz por genevieve_f94, atualizado more than 1 year ago
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Criado por genevieve_f94
aproximadamente 11 anos atrás
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Questão 1
Questão
What is the term for an area of the image where there is no returning echoes (black)
Responda
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hypoechoic
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anechoic
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echogenic
Questão 2
Questão
What are the advantages of ultrasound?
Responda
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Good soft tissue information, real time, no ionising radiation and accurate measure of structures
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Can carry out blood studies, relatively quick and cost effective, highly operator dependant, image interpretation
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Can carry out blood studies, ionising radiation, real time and accurate measure of structures
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Highly operator dependant, accurate measure of structures, image interpretation, highly operator dependant
Questão 3
Questão
True or False. The frequency of ultrasound is below the human hearing?
Responda
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True
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False
Questão 4
Questão
What frequency range is used for ultrasound?
Responda
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20-20,000Hz
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1-20MHz
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20-40MHz
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1-20Hz
Questão 5
Questão
What are the four basic components of ultrasound equipment?
Responda
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Transducer, monitor for display, housing with electronics and controls, coupling gel
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Transducer, timing device, housing with electronics and controls, recording device
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Transducer, monitor for display, housing with electronics and controls, recording device
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Transducer, timing device, housing with electronics and controls, coupling gel
Questão 6
Questão
When was the piezoelectric effect discovered by Jacques and Pierre Curie?
Responda
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1980
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1950
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1850
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1880
Questão 7
Questão
Name the two basic waves by which energy can be transmitted from one point to another
Responda
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electromagnetic and mechanical waves
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sound and mechanical waves
Questão 8
Questão
True or False? Light and X-rays are electromagnetic waves
Responda
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True
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False
Questão 9
Questão
What are mechanical waves described as?
Responda
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propagation of energy through a medium by cyclic pressure variations
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distinguished by energy, frequency and wavelength
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Man-made forces changing the frequency of the wave
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similar to ocean waves
Questão 10
Questão
Which of the following deformable elastic mediums can be used for propagation?
Responda
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Air
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Water
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Soft tissue
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All of the above
Questão 11
Questão
What is the frequency of a wave?
Responda
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The difference between maximum value and equilibrium value
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Length of one cycle
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The number of cycles that occur per second
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The speed of the soundwave as it passes through the tissue
Questão 12
Questão
True or false? With heavier molecules the sound transmits with faster velocity
Responda
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True
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False
Questão 13
Questão
True or False? With more compressable materials (eg air) the sound transmits at a lower velocity
Responda
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True
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False
Questão 14
Questão
What part of the beam affects the strength of the echo?
Responda
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intensity
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transducer
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shadowing
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placement
Questão 15
Questão
What is the change in direction of an ultrasound beam when it crosses a boundary at an angle?
Responda
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Rarefraction
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Attenuation
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Beam angling
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Focusing
Questão 16
Questão
What do the attenuation processes include?
Responda
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absorption
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Divergence
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Scattering
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Reflection
Questão 17
Questão
Which of the following has the lowest attenuation coefficient?
Responda
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Blood
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Lung
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Soft Tissue
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Brain
Questão 18
Questão
Absorption
Responda
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Is a result of internal friction forces
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Is when ultrasound energy is converted into heat
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Is the change of direction the beam takes when passing through different structures
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Directly removes energy from the beam
Questão 19
Questão
True or false? Beam divergence cannot occur after refraction of a curved surface
Responda
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True
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False
Questão 20
Questão
What is Rayleigh scattering?
Responda
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When the interface the beam hits is
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When the interface the beam hits is >1 wavelength, scattering occurs equally in two directions
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When the interface the beam hits is >1 wavelength, scattering occurs equally in all directions
Questão 21
Questão
Why is scatter a disadvantage?
Responda
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only a small portion of the beam returns to the transducer
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It creates radiation dose to the patient
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scattered waves interact with each other to form back scatter patterns
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Mentally affects the operator
Questão 22
Questão
Which kind of reflection occurs when a soundwave strikes a large smooth surface?
Responda
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non-specular
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diffuse
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specular
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acoustic
Questão 23
Questão
What is acoustic impedance a product of?
Responda
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the material's density and velocity of ultrasound in the material
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the ultrasound's density and the velocity of the material
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the weight of the transducer and the velocity of ultrasound in the material
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the interface beam angle and the material density
Questão 24
Questão
True or False? Far gain is the amount of gain applied to the distant echoes
Responda
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True
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False
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